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A current transformer's secondary must never be

  • A.connected to an ammeter of low impedance
  • B.left open circuited while primary current flows
  • C.short circuited when it is not in use
  • D.earthed at one point in the secondary circuit

Answer: B

With no secondary ampere-turns to oppose the primary, the core saturates and a dangerous voltage appears at the open terminals. Shorting links are fitted for exactly that reason and the earth connection is a safety requirement.

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